Numerical Simulation Of Activated Sludge Process Based On Adsorption Penetration Degradation Model

Based on the theory of "adsorption-infiltration-degradation" proposed by the research group,this paper establishes an unsteady simulation model with the mathematical discretization idea to simulate the dynamic process of COD and ammonia nitrogen in domestic sewage treatment with activated sludge?In this paper,the parameters required for the unsteady simulation model(activated sludge adsorption rate,sludge growth decay rate and ammonia nitrogen removal rate)are obtained experimentally,and the single variable variation of activated sludge concentration,temperature and pH is obtained through experiments to simulate model parameters.Influence and fit,the process of treating COD and ammonia nitrogen with activated sludge under unsteady condition was analyzed,and the mathematical expression was established.The simulation curve is obtained by simulation,and compared with the experimental data,the rationality of the simulation program is verified.It was found that with the changes of sludge concentration,pH and temperature,the removal trend of COD and ammonia nitrogen in the simulation program was consistent with the experimental change trend,indicating that the simulation program is feasible;the simulation curve can be used to determine the sludge concentration,pH and temperature.When the variable is increased,the rate of removal of COD and ammonia nitrogen by activated sludge is also increased.The effect of sludge concentration on COD and ammonia nitrogen in activated sludge is greater than temperature and pH.The effect of temperature on COD and ammonia nitrogen in activated sludge treatment is higher.The influence of pH is large;the comparison between the simulation curve and the experimental data shows that the prediction of the start time of ammonia nitrogen removal is not accurate,but the effect of the overall decline trend of ammonia nitrogen is better.There are still some shortcomings in the simulation model.There are still errors in the simulated COD and ammonia nitrogen drop curves and experimental data.It is necessary to further study the process of removing activated organic matter and ammonia nitrogen from activated sludge to make the simulation procedure more accurate.